Jump leaf extension table



Nov. 14, 1933. F. B. WALTER JUMP LEAF EXTENSION TABLE 1931 2 Sheets-Sheet l Filed May 18 .mwmmwwwwwwwm gwwnkw Frederic/f. W/Zel;

, www QW uw QM nu wmv@ NOV. 14, 1933. F. B WALTER 1,935,531

JUMP LEAF EXTENSION TABLE Filed May 18. 1951 2 Sheets-Sheet 2 j 16' j 36404546' 1316' j f J if 54 5 ff ff d@ O o J1 zz f Z55 gfsfx Q" 16j ZZ/K 3 5529: 45 ".54" /ff f2 --zaf s f/ 35 J0 2'# f j Frederic/Z55, W/ez;

Patented Nov. 14, 1933 f wm STATES PATEv orgies p v1,935,531` s JMP'LEAF EXTENSION TABLE Y Frederick B. Walter, IWabash, Ind., assigner to y w B. Walter & Company, Incgwabash, Ind., a,

corporation of Indiana Application May 1s, 1931. seria; Np. 538,270.

s claims. (c1. 45-112 termediatefsection into the plane of the mainv sections, afterwhich themain sections may be moved toward each other to form, with said intermediatesection, a continuous plane;4 and that subsequent separation of said main sections will automatically depress theg intermediate section, whereafter the main sections may be moved together to return to their initial positions. Fur-` ther objects of the invention vwill appear as the vdescription proceeds.

To the/accomplishment of the above andrelated objects, my invention may be embodied in the formv illustrated inthe accompanying drawings, attention being called to the fact, however, that the drawings vare illustrative only, and that change may be made in the specific construction illustrated and described, so long as the scope of the appended claims is not violated.

Fig. `1 is a broken side elevation of a table constructed in accordancewith the present invention, parts thereofv being shown in section;

Fig. 2'is a broken bottom plan view of the same;

Figs. 3, 4, andV 5 Aare views similar toFig. 1,

showing the parts in various positions of ad-l justment; Y. Fig. 6 is an enlarged side elevation of the cam and cam operator, the view being taken from the side opposite that from which Figs. v1 and 3 to v5 are taken; and

` Fig. 7 is a central longitudinal section through the cam and cam operator, the partsbeing in 7 the positions shown uin full lines in Fig. 6.

Referring more particularly to the drawings, ,it will be seen'thatl'have illustrated a table top comprising apairof stationary slide members'lO to which are secured spaced transverse bars 11- and 12. A lpair of slides 13 are Yslidably associated with the stationary members 10, and said slides carry a main top section le provided,'ron its inner edge, with a vplurality of` dowels 15. YThe slides .13 co-act with the outer'edges of the members 10.

A second pair of slides 16, cO-vacting withthe inner edgescfgthe members 10, carry a second main. top section 17, said section being formed Pivotally mounted at 45 on jacentthe ear 29 is a cam operator 46. Referring to Figs. 6 and .7 it willbe seen that said cam.

on its inner edge with a plurality of sockets '18 for cooperation with the dowels 15. Y

One of the slides 16 carries, on its'inner lsurface, al bracket 19 from which a linger 20 projects inwardly for a purpose later to be stated.v

A pairoi upstanding brackets 21 are mounted upon thevcr'oss piecell, and a similar pair of upstanding brackets22 are mounted on the cross piece 12 in alignment with the bracketsV 21. A pair of arms or ,levers 23 have their one ends pivoted to the upper ends of the brackets 21,'and

arm 26, and a pin 32 issecured in said ear and carries, at, its free end, a contractile spring 33. Means may be provided for adjusting the position of the spring 33 longitudinally of the pin 31.

The free end "of the spring 33 is anchored 0n the ear 30, and .it is to'be understood that, if

necessary or "desirable, aY second spring correthe ear 29 and to an arm 23. f ,l

One arm 23. iskpivotedpiintermediate itsA ends,

yspending to the spring 33Y` maybe anchored to `as at.34, to one end of thel bracket 27;` and one arm 26 is pivotedjint'ermediate its ends, as at 35, tothe Vopposite end of the bracket 27.l The projecting ends of said two arms 23 and26 are pivoted to eachother as at 36, relativefmovement ofthe two arms 23 andr 26 being permitted by the link 25.

Pivotallylmounted at 37 on the bracket 27 ad-.

Ijacent the y:ear 3A0 is a cam member 38. Referring to Figs. 6 and v7, itwill be seen thatthe member "38 comprises a shell pivotallymounted intermediate its ends on the pivot 37, and formed yadjacent its one end -with a longitudinally exltending'slot lBain whichA is lreciprocaloly mounted a` pin 4,0. To said pin Llil is secured a plunger l11,-andan expandingspring 42 is sleeved Vover said plunger, bearing at its one end againsta shoulder 43 on said plunger, and at its opposite end against thefendfllof the vslfrellr38. As will be obvious, the spring'42l urges'the pin 40 toward that end of the slot 39 more remote from the pivot 37. K

the bracket 27 'adrot operator 46 comprises a plate having its one end 47 secured to the pin 40. Said plate is mounted intermediate its ends on the pivot 45, and at its opposite end is rebent, as at 48, to provide a lip 49 parallel with the body portion of said operator 46. As is clearly shown in Fig. 6, the lip 49 is shaped to provide a pair of cam surfaces 50 and 51.

The feet 28 of the bracket 27 are secured t0 the under surface of an intermediate leaf section 52, said section being provided in its one edge with sockets 53 for co-action with the dowels 15, and in its other edge with dowels 54 for coaction with the sockets 18.

The top sections 14 and 17 are connected for coordinate movement in a Well known manner, as by the provision of a pinion 55 on the element 10 and co-acting racks 56 and 57 on the slides 13 and 16.

The normal positions of the parts are illustrated in Fig. 5. If, when the parts are in this position, one of the top sections 14 or 17 is moved outwardly, the other section will be correspondingly moved outwardly through the co-action of the racks 56 and 57 with the pinion 55. As the section 17 moves towardthe left, as viewed in Fig. 5, the bracket 19, being carried by one of the slides 16, is correspondingly moved. The lip 49 is positioned, at this time, out of the path of the nger 20, `so that said finger 20 passes the cam operator 46 without affecting the same and contacts the adjacent edge surface of the cam 38. Said cam surface is inclined down- Wardly and to the left so that, as the finger 20 moves farther toward the left, the cam 38 is forced upwardly, since rotation of the cam in a counter clockwise direction aboutV its pivot 37 is prevented by the pin 4o which engages said cam and the cam operator 46. Asis clearly shown, lines drawn from the pin 40 to the pivot 37 and to the pivot 45 are, when the parts are positioned as in Fig. 5, substantially perpendicular to each other. L

The armsv 23 and 26 being secured to the bracket 27 will be moved, respectively, in clockwise and counter clockwise direction, the spring 33 assisting in this movement, the strength of said spring being such as substantially to counterbalance the weight of the leaf 5?.w lThe parts are so arranged'andproportioned that, when the limit of movement of the section'17 is reached, the finger 20, in cooperation with the cam 38, willhave moved the Vassociated parts into the position of Fig. 1, Wherein'the section'52 is disposed in the plane of the sections 14and 17.

The sections 14 and 17 may now be moved toward each other, the leaf V52 being held in position by the spring 33. As said sections are so moved, the finger 20 comes into contact with the face 51 of the lip 49. Further movement of the finger 20 in unison with the section 17 will cause the cam operator 46 to be oscillated in a counter clockwise direction about its pivot 45,

'compressing the spring 42.r As the dowels 15 and 54 enter the sockets 53 and 18, the cam operator is moved beyondrits dead-center position with respect to the cam 33, and the spring 42 expands to move the cam and cam operator into the positions illustrated in Fig. 3. A slight further movement then brings the table top sections into position to form a single, extended plane surface.

When the table top sections 14 and 17 are again separated, the finger 20 contacts the opposite side surface of the cam 38, which is nOW inclined upwardly and to the left, as viewed in Fig. 3, to depress the section 52, the spring 33 being extended as the depression of the section 52 is completed, the arms 23 and 26 guiding the movement of said section. As the sections 14 and 17 are again moved toward each other, the finger 2O contacts the face 50 of the cam operator 46 to rotate said operator in a clockwise direction about its pivot 45, whereby the parts are returned to the positions of Fig. 5.

I claim as my invention:

1. A jump leaf table comprising a base, a pair of main top sections mounted on said base, said sections being relatively laterally movable, an intermediate top section, means guiding said intermediate top section for vertical movement into and out of the plane of said main sections, and automatic means for shifting said intermediate section into and out of said plane alternatively upon successive separations and reunions of said main sections, said last-named means Acomprising a finger shiftable with one Yof said mainsections, and cam mechanism shiftable with respect to said intermediate section and cooperable with said finger.

2. A jump leaf table comprising a base, a pair of main top sections mounted on said base, said sections being relatively laterally movable, an intermediate section, means guiding said intermediate section for vertical movement into and out of the plane of said main sections, meansV cooperable with said guiding means for counterbalancing the weight of said intermediate section, and automatic means for shifting said intermediate section into andY out of said plane alternatively upon successivev separations and reunions of saidmain sections, said last-named means comprising a nger'shiftable with one of said main sections, and shiftable cam mechanism solely supported on saidintermediate section and cooperable with said nnger. Y

3. A jump leaf table comprising a base, a pair of main top sections mounted on said base, said sections being relatively laterally movable, an intermediate section, means guiding said intermediate section for vertical movement into and out of the plane of said main sections, and automatic means for shifting said intermediate section into and out of said plane alternatively upon successive separations and reunions of said main sections, said last-named means compris- `ing a finger shiftable with one of said main sections, and a cam solely supported on said intermediate section and engageable by said'nger, as said main sections are separated, to shift said intermediate section.

4. A jump leaf table comprising a base, a pair of main top sections mounted on said base, said sections being relatively laterally movable, an intermediate section, means guiding said intermediate section for vertical'movement into and out of the plane of said main sections, and automatic means for shifting said intermediate section into and out ofv said plane alternatively upon successive separations and reunions of said main sections, said last-named means comprising anger shiftable with one of said main sections, a cam carried by said intermediate section and engageable by said finger, as said main sections are separated, to shift said intermediate section, and a cam operator associated with vsaid cam and engageable by said nger, as said main ,sections are reunited, to shift said cam. Y

5. A jump leaf table comprising a base, a pair of main top sections mounted on said base, said sections being .relatively laterally movable, an intermediate section, means guiding said intermediate section for vertical movement into and out of the plane of said main sections, and automatic means for shifting said intermediate section into and out of said plane alternatively upon successive separations and reunions of said main sections, said last-named means comprising a nger shiftable with one oi said main sections, a cam elementpivoted intermediate its ends on said intermediate section, and a cam operator pivoted intermediate its ends on said intermediate section and having one end -pivotally associated With an end of said cam, said cam and cam operator being positioned for cooperation with said nger whereby, as said main sections are moved apart, said finger passes said cam operator and engages said cam to elevate said intermediate section; as said main sections are subsequently moved toward each oher, said nger engages said cam operator to shift said operator and said cam abouttheir pivots on said inter-l mediate section; as said main sections are again moved apart, said iinger again passes said cam operator and engages said cam to depress said l intermediate section; and as said main sections are again moved toward each other, said finger engages said cam operator to return said operator and cam to their initial positions.

6. A jump leaf table comprising a base, a'pair of main top sections mounted on said base, said sections being relatively laterally movable, an intermediate section, means guiding said intermediate section for vertical movement into and out of the plane of said main sections, and automatic means for shifting said intermediate section into and out or said plane alternatively upon successive separations and reunions oi said main sections, said last-mentioned means comprising a finger shiftable with one of said main sections, a cam element pivoted intermediate its ends on said intermediate section, a cam operator pivoted intermediate its ends on said intermediate section and having one end pivotally associated with one end of said camelement, whereby said-cam and cam operator are dependently shiftable through approximately about their Arespective pivots, said cam' and operator being positionedfor cooperation Withsaid nger, and means resiliently holding said cam and operator in either of their extreme positions.

7. A jump leaf table comprising a base, a pair of main top sections mounted on said base, said sections being relatively laterally movable, an intermediate section, means guiding said intermediate section for vertical movement into andl out or" the plane of said main sections, and automatic means for shifting said intermediate section into and out of said plane alternatively upon successive separations and reunions of said main sections, said .last-named means comprising a finger shiftable with one of said main sections, a

cam element pivoted intermediate its ends on said intermediate section, a cam operator pivoted intermediate its ends on said intermediate section and having one end pivotally associated with one end oi saidcam element, whereby said cam and camv operator are dependently shiftable through approximately 90 about their respective pivots, saidcam and operator being positioned for cooperation With said finger, and being so associated that, in either of their extreme positions, lines drawn from the point of connection successive separations and reunions of said main sections, said last-named meansl comprising a ringer shiftable` With one of said main sections, a cam element pivoted intermediate its ends on said intermediate section, said element being formed, adjacent one end, With a longitudinally extending slot, a pin mounted for movement in slot, spring means urging said pin toward the end of said slot remote from the pivot of said element, and a cam operator pivoted intermediate its ends on said intermediate section and having one end connected to said pin, said cam and operator being positioned ior cooperation With said nger.

FREDERICK B. WALTER. 

